/************************************************************************** * * Copyright 2010 VMware, Inc. * All Rights Reserved. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sub license, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice (including the * next paragraph) shall be included in all copies or substantial portions * of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. * IN NO EVENT SHALL THE AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. * **************************************************************************/ /** * Transform feedback functions. * * \author Brian Paul * Marek Olšák */ #include "main/bufferobj.h" #include "main/context.h" #include "main/transformfeedback.h" #include "st_cb_bufferobjects.h" #include "st_cb_xformfb.h" #include "st_context.h" #include "pipe/p_context.h" #include "util/u_draw.h" #include "util/u_inlines.h" #include "cso_cache/cso_context.h" struct st_transform_feedback_object { struct gl_transform_feedback_object base; unsigned num_targets; struct pipe_stream_output_target *targets[PIPE_MAX_SO_BUFFERS]; /* This encapsulates the count that can be used as a source for draw_vbo. * It contains stream output targets from the last call of * EndTransformFeedback for each stream. */ struct pipe_stream_output_target *draw_count[MAX_VERTEX_STREAMS]; }; static inline struct st_transform_feedback_object * st_transform_feedback_object(struct gl_transform_feedback_object *obj) { return (struct st_transform_feedback_object *) obj; } static struct gl_transform_feedback_object * st_new_transform_feedback(struct gl_context *ctx, GLuint name) { struct st_transform_feedback_object *obj; obj = CALLOC_STRUCT(st_transform_feedback_object); if (!obj) return NULL; _mesa_init_transform_feedback_object(&obj->base, name); return &obj->base; } static void st_delete_transform_feedback(struct gl_context *ctx, struct gl_transform_feedback_object *obj) { struct st_transform_feedback_object *sobj = st_transform_feedback_object(obj); unsigned i; for (i = 0; i < ARRAY_SIZE(sobj->draw_count); i++) pipe_so_target_reference(&sobj->draw_count[i], NULL); /* Unreference targets. */ for (i = 0; i < sobj->num_targets; i++) { pipe_so_target_reference(&sobj->targets[i], NULL); } for (i = 0; i < ARRAY_SIZE(sobj->base.Buffers); i++) { _mesa_reference_buffer_object(ctx, &sobj->base.Buffers[i], NULL); } free(obj); } /* XXX Do we really need the mode? */ static void st_begin_transform_feedback(struct gl_context *ctx, GLenum mode, struct gl_transform_feedback_object *obj) { struct st_context *st = st_context(ctx); struct pipe_context *pipe = st->pipe; struct st_transform_feedback_object *sobj = st_transform_feedback_object(obj); unsigned i, max_num_targets; unsigned offsets[PIPE_MAX_SO_BUFFERS] = {0}; max_num_targets = MIN2(ARRAY_SIZE(sobj->base.Buffers), ARRAY_SIZE(sobj->targets)); /* Convert the transform feedback state into the gallium representation. */ for (i = 0; i < max_num_targets; i++) { struct st_buffer_object *bo = st_buffer_object(sobj->base.Buffers[i]); if (bo && bo->buffer) { unsigned stream = obj->shader_program->xfb_program-> sh.LinkedTransformFeedback->Buffers[i].Stream; /* Check whether we need to recreate the target. */ if (!sobj->targets[i] || sobj->targets[i] == sobj->draw_count[stream] || sobj->targets[i]->buffer != bo->buffer || sobj->targets[i]->buffer_offset != sobj->base.Offset[i] || sobj->targets[i]->buffer_size != sobj->base.Size[i]) { /* Create a new target. */ struct pipe_stream_output_target *so_target = pipe->create_stream_output_target(pipe, bo->buffer, sobj->base.Offset[i], sobj->base.Size[i]); pipe_so_target_reference(&sobj->targets[i], NULL); sobj->targets[i] = so_target; } sobj->num_targets = i+1; } else { pipe_so_target_reference(&sobj->targets[i], NULL); } } /* Start writing at the beginning of each target. */ cso_set_stream_outputs(st->cso_context, sobj->num_targets, sobj->targets, offsets); } static void st_pause_transform_feedback(struct gl_context *ctx, struct gl_transform_feedback_object *obj) { struct st_context *st = st_context(ctx); cso_set_stream_outputs(st->cso_context, 0, NULL, NULL); } static void st_resume_transform_feedback(struct gl_context *ctx, struct gl_transform_feedback_object *obj) { struct st_context *st = st_context(ctx); struct st_transform_feedback_object *sobj = st_transform_feedback_object(obj); unsigned offsets[PIPE_MAX_SO_BUFFERS]; unsigned i; for (i = 0; i < PIPE_MAX_SO_BUFFERS; i++) offsets[i] = (unsigned)-1; cso_set_stream_outputs(st->cso_context, sobj->num_targets, sobj->targets, offsets); } static void st_end_transform_feedback(struct gl_context *ctx, struct gl_transform_feedback_object *obj) { struct st_context *st = st_context(ctx); struct st_transform_feedback_object *sobj = st_transform_feedback_object(obj); unsigned i; cso_set_stream_outputs(st->cso_context, 0, NULL, NULL); /* The next call to glDrawTransformFeedbackStream should use the vertex * count from the last call to glEndTransformFeedback. * Therefore, save the targets for each stream. * * NULL means the vertex counter is 0 (initial state). */ for (i = 0; i < ARRAY_SIZE(sobj->draw_count); i++) pipe_so_target_reference(&sobj->draw_count[i], NULL); for (i = 0; i < ARRAY_SIZE(sobj->targets); i++) { unsigned stream = obj->shader_program->xfb_program-> sh.LinkedTransformFeedback->Buffers[i].Stream; /* Is it not bound or already set for this stream? */ if (!sobj->targets[i] || sobj->draw_count[stream]) continue; pipe_so_target_reference(&sobj->draw_count[stream], sobj->targets[i]); } } bool st_transform_feedback_draw_init(struct gl_transform_feedback_object *obj, unsigned stream, struct pipe_draw_info *out) { struct st_transform_feedback_object *sobj = st_transform_feedback_object(obj); out->count_from_stream_output = sobj->draw_count[stream]; return out->count_from_stream_output != NULL; } void st_init_xformfb_functions(struct dd_function_table *functions) { functions->NewTransformFeedback = st_new_transform_feedback; functions->DeleteTransformFeedback = st_delete_transform_feedback; functions->BeginTransformFeedback = st_begin_transform_feedback; functions->EndTransformFeedback = st_end_transform_feedback; functions->PauseTransformFeedback = st_pause_transform_feedback; functions->ResumeTransformFeedback = st_resume_transform_feedback; }